其实2.6就修复了，大家4.2系统心率丢失的问题，需要用WIN7下的garmin express来更新心率套件到2.6/2.7
Changes made from version 2.60 to 2.70:
Correct issue which lead to increased standby current when device is powered down
Changes made from version 2.50 to 2.60:
Increase fidelity of the all-day heart rate plot
Improve cadence rejection
Improve performance during interval activities
Changes made from version 2.40 to 2.50:
Addressed issue which can cause wrist heart rate to remain on a fixed value.
Changes made from version 2.30 to 2.40:
Fixed potential heart rate lock to 66 beats per minute.
Increased battery life in 24/7 mode.
Changes made from version 2.20 to 2.30:
Improved heart rate accuracy(spikes, noise)
Increased battery life in 24/7 mode
Changes made from version 2.60 to 2.70:
Correct issue which lead to increased standby current when device is powered down
Changes made from version 2.50 to 2.60:
Increase fidelity of the all-day heart rate plot
Improve cadence rejection
Improve performance during interval activities
Changes made from version 2.40 to 2.50:
Addressed issue which can cause wrist heart rate to remain on a fixed value.
Changes made from version 2.30 to 2.40:
Fixed potential heart rate lock to 66 beats per minute.
Increased battery life in 24/7 mode.
Changes made from version 2.20 to 2.30:
Improved heart rate accuracy(spikes, noise)
Increased battery life in 24/7 mode
